Valve tone throat



Nov. 11, 1930. c. H. LARSSON 1,781,402

VALVE TONE THROAT Filed Feb. 15, 1929 3 Sheets-Sheet l I M56072) Q33" jw' vvvvvvvvvvvvv AT Patented Nov. 11, 1930 PATIENT OFFIGE oAann. LARSSON, or CHICAGO, ILLINOIS VALVE TONE THROAT Application filed February 15, 1929. Serial Nb. 340304.

This invention relates to means yforvtranss -mitti-ng sound from a plurality ofsouroes to a common outlet or loud speakerand selective means whereby anyone of said sources may be placed in communication with the outlet. More specifically, it provides a plurality of passageways or tone .throats through a sub stantially solid medium with a rotatable apertured member for connecting either of said passageways with \a common outlet and by i this means Iprovide an arrangement Whereby communication maybe made, for instance,

item a phonograph tone arm or a radio re- I v y i i W 'Ihe objectsfof (this invention are to proproducer element to a loud, speakeror ampli- 't' yinggchamberr I i vide a combined radio. and phonograph with means whereby eitherimay be connected with tone amplifier; tomprovide :a device of this character in which passageways areprovided -liiibm therespective tone producers to ac om- I mon outlet, and arotatable elementisutilized :fiorcompleting the connection from oneelement or thelother to such common outlet; "to

provide novel actuating means for rotating thejelement used for switching firomonetone producer, to janother and to; provide "such other novel features and improvements in constructionas will be described more fully hereinafter; i i 3 a 11 n the accompanying drawings illustrating i this invention,

fljfgure l ,isa plan view of a combined phonograph and radio instrument with my iimprqvedwalve ,or switch d i applied iitheretqp 1 p ,t Figure 215 mesa sectional view taken onat-heline 21-2 of Figurel; Y i

:1: iliguredis an enlargedsectional view showingTone form of valvethroat with communitcati onlestablished ,between t-heradio and the a l olidiepeaker- Flgure 4: 1s a viewsimilar to Figure 3 showingthe valve or switch turned toprovide communication between the phonograph and the loud speaker;

Figure 5 isa sectional View. taken on the ,line5-y-.-v.5orfFigure 2;

Figure 6 is a" sectional ,view similar to Figure Zi showing a modified form of construction in which the radio and phonograph munication from the phonograph tothe loud speaker.

The cabinet 8 as shown in these drawings may be of anyordinary oripreferred form of construction and is provided adjacent to the topywith a partition 9 having a hole .10'

through which projects the upper end or throat 11 of a tone amplifierior loud speaker, a portion thereof 'beingshown at 12. Atrocta-ngular block 13 is secured to the partition 9 and is of suificient size .to permit theforming of the necessary channels or throats therethroughland the mounting ofthe switching or valve element therein. The top 14: of the cabinet 8 engages with the block 13 and carries the phonograph and radio reproducing mechanism. The phonograph turn table l5may be driven by any suitable mechanism, as indicated ,at 16, and the phonograph tone arm 17 is pivotally mounted at 18 on the top 14, the top being provided with a hole 19 in alignment with the tone arm. The radio reproducer orloud speaker element 20 isalso mountedon the top 14, a convenient arrangement being the insertion of the outlet tube 21 in a hole 22 in the top. i y

As shown particularly inFigures 3 to 5, a channel or throat 23 in the blocklS leans from thehole 19 and is adapted to be connected at times with a common outlet channel or throat section 24 at the bottom of the block which connects with the throat 11 of the amplifier or loud speaker. Another channel or throat25 leads fromthe hole 22 through thejblock 13 and is also adapted to be .coni nected at times with the outlet opening 24.

The throatsor passageways 23 an c125 lead to one sideoit' a circular hole or valvechamber 26 which extends through theblock 13 and which is provided witha rotatable valve 27 which is mounted to turn therein. This valve has a transaxially formed throat secblock and adjacent parts to the loud speaker. T he'valve member 27 is also provided on the opposite side with'a recess'or passageway 29 which is adapted to be turned to register with the radio throat or passageway 25, as shown particularly in Figure 3 in order to complete ,the throat or opening from the radio to the amplifier or loud speaker. It will be noted that the throats or passageways from the tone arm and from the radio to the loud speaker v are of gradually increasing cross section throughout their length which prevents any restriction of the tones and; which tends to increase the volume ofthej sound passing therethrough. Furthermore, these passage- "ways or channels are formedthrough sub "stant'ially solid or rigid members so that there is little or no possibility of the tones being distorted or m'arred by undue vibration or by any rattling parts. i

Therotatable' valve 32 which are secured in ,plates or side pieces j 33 whi'ch are secured to the block l and which [cover the ends of:'the;hole26 in which the -fvalve ismounted. The trunnion 3O is p o: v'ide'd with a worm "wheel 34- which is en-"' gaged by a worm35 on a shaft 36 whichjis mounted in bearings 37 andwhich extends" out through one side of the cabinet-,as shown' 7 in Figure 2, whereit is provided with a hanj 'pass'ageways therethrough will ff 'into exact alignment with the respective phog radio throat channels through "dle or'wheel 38 for turning the'same. A stop finger 39' is'secured .tothe wheelpist anden- .gages'with stop pins tO and ll to limit the turning movement jo'f'the valve sothatrthe nograph and ii he p emnon-or this agate s1 subetan tially] self-evident, I as by turning the wheel or handle 381theva'1ve or switch member .27

' nograplroutput or may bejturned' to bring passageway 29 into alignmentwith the maybe turned to bring the passageway 28;

'intoalignment with 'the'hole 23 forthe phopassageway 25 torth radio-output; I

Dueto th'efdiiferent'types'oi construction 0f phonographs and"cabi11ets,there.1nay be.

considerable: variation in the locationlo'f the tone arm and radio element so that it is not always practicable to'have both these lo-f I cated' on one side'of the valve,as shown in:

" Figure 3, but th'ey may be located in any de sired positi nwith respect thereto; In the modified form of construction shownlin Fig;

'ure's't and 7, the radio inlet i op'enin i located onone side ofthe valve membcrpand 1 j-the phonograph inlet opening 4311s located I on, the opposite side ofthe, valve niember'd] The radio throat or passageway45 leadsfroin j the. opening 42andregisters at times with the throat section or passageway 46in the valve member 27 maybe supported and turned inany suitable manner but (is preferably provided with pivots or trun nions 30 and 31 which engage with bearings 25..

d as"? member 44 which in turn leads to the outlet .47. The phonograph throat or. passageway 48' registers at times with the throat section 49 through the. valve 4d, the opposite end of which also registers at times with the outlet 47 whichleads to the loud speaker throat ll;

otherwise theconstruction and operation of 7 this form is substantially the same as the one heretofore described, but it will also be noted that agasket or washer or resilient material 50 may bein t erposed between the end of the throat 11' and the block in order to make a tight closure and to preventany possibility i of vibration or rattling at this point.

Fromthis' description it'will be seen that I provides novel apparatus for use in con: nection with combined phonographs and "ra- 'diosfwhereby the loud speaker, or amplifier.

may be connected with one or the other. Furmi 6 p geways thus provided are? in thenature ofthroa-ts and so proportioned as to transmitthe sound the best manner possible,

' Having thus described invention,

' which, however, I do not wish to limit to the exact arrangement herein shown" and described, except; as specified in the "following claims, what I. claim and desire-tozsecure by Lettr'slPatentisz J 1. In adevice ofthe character set forth the combination of a phonograph tone arm,

7 a radio reproducer, a loud speaker adapted ,to'project tones from said tone arm orsaid reproducer, 'a'block rigidly mounted between V the tone arm" and reproducer. and the loud:

said block'to the loudspeaker, a"rotatable =-mo speaker, passageways ,leading from the tone f p amt-a d reproducer respectivelyfthrough I valve for, controlling 'saidpassageways, a, l

gearsecuredto said valve, a second gear en'-' T" ga'gin'g with said gear, ashafton which'the secondgearis mounted, and means-for turn- 'ing saidlshaftgf i V 2. The combination witha'cabinet, of a loudspeaker mounted therein and having an ll inlet throat, .a valvebody mountedgabove the inlet 1 throat and having'an outlet coniictd he -W th; a phono r ph e'arm mounted adj acen tito said body, apassageway [leading from the tone arm through the-body I to said outlet, a radio 'reproducer also mount;

edadjacent to said body, apa'ssageway leadjecting through said partition, a block'mounte edabove the partitiom a top forthecabinet above saidfblock, aphonograph mounted on v "13a said topfand having itstone arm' rotatably mounted in the top above the block, a radio reproducing element mounted in the top above the block, tone throats of increasing diameter leading from the tone arm and the reproducer element respectively through the block to the inlet of the tone amplifier, a circular body rotatably mounted in the block and having tone throat sections therethrough adapted to register at times with said tone throats, said tone throat sections increasing in diameter to conform to said tone throats, and means for rotating said circular body.

4:- In a device of the character set forth, the combination of a block having two passageways leading'from separate inlets to a common outlet, said block having a cylindrical hole therethrough whichintercepts said passageWays,-a cylindrical rotatable member mounted in said hole and extending through the block, said member having openings for establishing communication at times from the respective passageways to the outlet,'sides secured to said block and covering the ends of said hole, trunnions for said rotatable member, bearings in said sides for said trunnions, a worm gear secured to one of said trunnions, a worm engaging with said gear, a rod on which said Worm is mounted, bearings for said rod, a handle for turning the rod, an arm secured to said worm gear and stops adapted to be engaged by said arm 11:30 limit the movement of said rotatable mem- 5. In a device of thecharacter set forth, the combination of a solid block formed of wood or the like having tone throats leading from separate inlets to a common outlet, a rotatable member in said block coacting with said throats and having throat sections them 40 through which form sections of the first named throats, the arrangement being such that when the rotatable member is turned to one position communication through one of said throats will be established and when the rotatable member is turned to another po- 7 sition, communication through the other throat will be established, said throats being of gradually increasing cross section, substantially as described. i

an a CARL H. LARSSON. 

